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Revenues - Outstanding Contract Asset and (Liability) Accounts (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract assets	$ 82,986	$ 68,157	$ 68,971	$ 73,039
Change in contract assets – increase (decrease)	14,015	(4,882)
Contract liabilities	311,674	198,660	$ 215,093	$ 167,306
Change in contract liabilities – increase	(96,581)	(31,354)
Net change	$ (82,566)	$ (36,236)

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- Definition

Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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+ References

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